Silo-door construction.



A. N. BRAGSTAD. SILO DOOR CONSIRUC-HON. APPLICATION FILED AUG. 1a, 1914.

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Patented Jan. 4, 1916.

0 A 1 0 o w m fl 5 m o mo 0 1 ID k Fmfl. H 1 9w O 70 O m w m o m, F. 9 OO m 6 3 K m 3 h m 4 10 17V Lg 'ADOLPH N. BRAGSTAD, OF CANTON, SOUTHDAKOTA.

SILO-DOOR CONSTRUCTION.

Specification of Letters Patent.

Patented Jan. 4, 11.916.

Application filed August 18, 1914. Serial No. 857,376.

To all) whom it may concern:

Be it known that I, Aoonrn N. BRAGSTAD, a. citizen of the United States,residing at Canton, in the county of Lincoln and State of South Dakota,have invented certain new and useful Improvements in Silo-DoorConstruction, of which the following is a specification.

This invention relates to certain new and useful improvements insilo-door construction.

The primary object of this invention is to provide a door constructionespecially adapted for employment with silos built of concrete blocks, aplurality of such constructions being arranged one upon the other andforming a vertically arranged series of separate openings, each providedwith its individual door.

It is also designed to form a, door construction consisting of the frameand the door, the door being provided with a lock and hinges and theframe supporting ladder steps which cooperate with similar steps of theadj accntlv positioned construction.

Another object of the device is to provide double hinges for the silodoor for floating the door directly into the frame when closing butallowing the door to swing to its fullest extent rearwardly when opened,the door itself being hollow forming a heat insulating air spacetherein.

\Vitlr these general objects-in view and others that will appear as thenature of the' invention is better understood, the same consists in thenovel combination and far rangement of. parts to be hereinafter morefully described, illustrated in the accompanying drzuvings, and setforth in the appended claims.

In the drawings forming a part of this application and in whichlike-designating characters refer to corresponding parts throughout theseveral views, Figure 1 is a perspective view of the exterior of thede-' vised door construction illustrating the door in its open position,and with the adjacent blocks positioned in the course of construction.Fig. 2 is an enlarged exteriorfront view of the device with the doorclosed. Fig. 3 is a central vertical transverse'scctional view thereof.Fig. 4 is a central horizontal transverse sectional view of the same,and Fig. 5 is an enlarged detail view of one of the door hinges and theadjacent portions of the members connected thereby.

Referring more in detail to the drawings,

it will be noted that the invention is de signed to provide a door, or aseries of doors vertically arranged through the side wall. of a silowhich is constructed of concrete blocks 10.

The present construction is preferably formed entirely of metal, andconsists of the rectangular frame 11 providing the doorway or opening 12therethrough. The

opposite side walls 13 of the frame 11 have longitudinally positionedspaced-apart angle-irons 14: upon their outer sides, which angleironsare adapted to engage and position the blocks 10 in their spacedrelations and forming an air-space 15 therebetween after the usualmanner of this form of construction of block silo-walls. Band wires 10are adapted to be secured at their ends through openings 17 of theangle-irons 1i and to lie between the blocks at each layer thereofthroughout the wall formation.

Channel-irons 18 bent in substantially U- shaped steps are secured tothe frame 11 preferably interiorly thereof, and adjacent the top andbottom walls 19 of the frame. It will be apparent that when the entirewall of the silo is completed after this manner, and with a plurality ofthe door frames mounted upon each other and secured with-. in the wall,that the lower step of each frame will substantially aline and lie ad-"jacent to the upper step of the adjacent door frame, and in this'mannera complete ladder of uniformly spaced steps will be formed from thebottom to the top of the walls. l r

A door 20 is provided for the frame which isrectangular in shape and isformed hollow and with an inner air-chamber 01' space 21 which rendersthe door insulated againstheat. The frame 19 is provided with anangle-iron inwardly projecting fian e 22 positioned entirely aroundwithin the fi'ame, and the door 20 is adapted toclose by a straightinward movement so as to seat its outer face 23 firmly and flatlyagainst the inner side of the said flange 22, and contacting a cushionpacking 22 upon the said flange.

The edges of the door 20 are provided with a completely encirclingflange 2st formed by projecting the inner wall 25 of the door at' eachside thereof. In. the door closing operation, the side edges 24: of thedoor are adapted to Slide. within and in con;

ings.

tact with the inner face of the rame 11 so that when completely closed,the door face 23 seats upon the frame flange cushion 22 and the doorflange 2a rests upon the inner edge of the door frame 11, thus formingan air insulated door opening inwardly of the silo and forced closed bythe contents of the silo. A swinging lock or latch 26 is pivoted to theexterior of"th?-i do or and adapted to engage over the adjacent portionof the frame flange 22 for retainiiig the door closed as illustrated inFigs. 2 and a of the drawhe special form of hinges now provided consistsof the end leaves 27 which are secured to the outer face of the door ata point spaced from the hinged edge thereof, and to the outer side ofthe adjacent frame flange 22. Leaves 28 of equal'length are centrallyhinged together as at 29 and are in turn hinged at their free ends asat30, to the inner edges of said end leaves 27. Connecting strips 31 aresecured between .the oppositely positioned leaves 28, which insures auniform movement of the hinge members. i

From this detail description of the door and hinge formation, it will beseen that by reason of the double leaves provided for the hinges, thatthe door is capable of swinging entirely inwardly of the silo and free Iand clear from the door frame 11 as illustrated in Fig. ,1, while thedirect closing of the door folds the hinges with a flat engagementbetween the leaves 28 thereof as illustrated in Fig. 4, and inwardly ofthe frame flange 22 andallowing the door to flatly eninsulating meansthroughout the entire area of the silo exterior. I 1

While the forms of the invention herein shown and described, are whatare believed to bevthe preferable embodiments thereof,

maestro minor changes may be made therein. without departingfr'om thespirit and scope of the invention as claimed.

iv hat I claim is l. The combination with a-metallic door frame having aflange projecting inwardly therefrom in spaced relation to the outeredge of the frame whereby to form a door receiving rabbet; of a doorfitted within the rabbet; and hinges connecting the door and frame, eachconsisting of four leaves, the intermediate leaves being free from theframe and door and the terminal leaves so connected, respectively, tothe frame and door as to cause the intermediate leaves to lie in a planeparallel to the door when the door is closed, whereby said hinges permitdirect lineal movement of the door into and out of the frame and permitof close seating of the door throughits periphery.

2. The combination with a metallic door frame having a flange projectinginwardly therefrom in spaced relation to the outer edge of the framewhereby to form a door receiving rabbet, of a door fitted within therabbet, and hinges connecting the door and frame, each consisting offour leaves, the

intermediate leaves being free from the frame and door and the terminalleaves so connected, respectively, to the. frame and door as to causethe intermediate leaves to lie in a plane parallel to the door when thedoor is closed, whereby said hinges permit direct lineal movement of thedoor into and out of the frame and permit of close seating of the doorthrough its periphery, said hinges being further so arranged, as'topermit folding of the door flatly, against a structure carrying theframe, when the door is open. o

In testimony whereof I affix my signature in piesence of two witnesses.

ADOLPH n. enaesran.

Witnesses:

OLE OSHEIM, H. A. HANSON.

